Upgrade hystrix to 1.4.16

fixes gh-561

pom.xml

@@ -28,7 +28,7 @@
 		<archaius.version>0.6.5</archaius.version>
 		<eureka.version>1.2.5</eureka.version>
 		<feign.version>8.10.0</feign.version>
-		<hystrix.version>1.4.15</hystrix.version>
+		<hystrix.version>1.4.16</hystrix.version>
 		<ribbon.version>2.1.0</ribbon.version>
 		<zuul.version>1.0.28</zuul.version>
 		<rxjava.version>1.0.11</rxjava.version>